Amplifier with signal-dependent voltage supply source
US4507619A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1982 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | Oct 25, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/0227
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a combination of an amplifier (2,5,6) and a signal-dependent voltage supply source (16-23) coupled thereto, a portion of the signal from a signal source (1) is applied by an amplifier (9) to a comparator (16), the output signal of which controls a limiter (20-21). A portion of the output signal thereof is applied as a feedback signal to a second input of the comparator (16) by means of a low-pass filter (22) and a feedback network (23) in series. The feedback loop thus formed is arranged so that it oscillates at a comparatively high frequency. A signal-dependent modulation of the pulse width and/or the pulse density then occurs at the limiter output. A supply voltage for the amplifier is derived from the output of the filter (22). Owing to the high feedback factor of the feedback loop at the signal frequencies the supply voltage can adequately follow the output signal of the amplifier independently of component tolerances and any load variations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.